Once you get to see how an apk is downloaded, next you will need to install that apk onto the T2.
That means you transfer the apk from PC to a storage device (USB drive or other).
Then Insert that device into the T2.
then you will need to have an open File Manager or an App Installer on your T2
That T2 has one or two of them type manager/tools, but I forget what they are called exactly, I haven't had a T2 here since maybe 5 years now.
So once you find that and open it and thru that manager you can search for the USB drive and then click on the apk file. You may get a message right about now, saying you need to 'Allow From Other Sources'.
Sometimes this will be done automatically the first time you try installing an apk, that is why I waited till now to mention it. I said this before, I think

But if it does not do it auto, then you will need to find that setting in your T2 menus and set it to Allow.
Once all this happens, then the apk will install and then the app will show up on your T2 (in your All Apps or My Apps folder)